IPA: //ˈjoʊkˌmeɪt//
KK: /joʊkˌmeɪt/
A person or animal that is paired with another in a team, especially in work or labor, similar to a partner or companion.
The farmer worked alongside his yokemate to plow the fields.
Yokemate is formed from "yoke" (from Old English "geoc", meaning a wooden beam used to join two animals) and "mate" (from Old English "gemetta", meaning a companion or partner). The word "yokemate" refers to a partner or companion that is joined together with another, much like animals yoked together for work.
Think of a 'yoke' that joins two animals together, and 'mate' meaning a partner — a yokemate is a partner that is joined together with another.
No commonly confused words.